Log message:
net/ocsync: Install manpages into ${PKGMANDIR}.
This project uses CMake to configure the software. Force the
manpages to be installed into ${CMAKE_INSTALL_MANDIR}, which is
defined by the included GNUInstallDirs CMake module. The correct
environment variables are passed so that ${CMAKE_INSTALL_MANDIR}
points into ${PKGMANDIR}.